Connecting SAS cables to the expansion enclosures
Connect SAS cables to the expansion enclosures.
About this task
This task applies if you are installing one or more expansion enclosures.
Be aware of the following guidelines when you attach the cables to the SAS
ports.
- No more than five expansion enclosures can be chained to port 1 (below the control enclosure). The connecting sequence from port 1 of the node canister is called chain 1.
- No more than four expansion enclosures can be chained to port 2 (above the control enclosure). The connecting sequence from port 2 of the node canister is called chain 2.
- Do not directly connect ports on canisters above the control enclosure with ports on those canisters below the control enclosure.
- Attach cables serially between enclosures; do not skip an enclosure.
- The last enclosure in a chain must not have cables in port 2 of canister 1 and port 2 of canister 2.
- Ensure that cables are installed in an orderly way to reduce the risk of cable damage when replaceable units are removed or inserted.
- Arrange your cables to provide access to the following components:
- USB ports. USB port access is required when you use a USB flash drive to configure the system.
- The enclosures themselves. Access is required to the hardware for servicing and for safely removing and replacing components by two or more people.
- Ensure that each SAS cable is fully inserted. A click is heard when the cable is successfully
inserted.Note: If you make a mistake during cabling and must unplug a SAS cable, pull the blue tag to release the cable.
Procedure
- Attach the SAS cables from the control enclosure
to the first expansion enclosure as shown in Figure 1. Remove the protective
end covers, if necessary. The first expansion enclosure is below the
control enclosure. Figure 1. Attaching an expansion enclosure to the control enclosure
- Port 1 1 of the left canister, control enclosure, attaches to Port 1 2 of the left canister, expansion enclosure 1.
- Port 1 3 of the lower canister,
control enclosure, attaches to Port 1 4 of
the lower canister, expansion enclosure 1. The port locations on the
lower canister are inverted from the port locations on the left canister.
Port 1 on the lower canister is opposite port 1 on the left canister. Note: The connecting sequence from port 1 of the node canister is called chain 1.
- Attach the SAS cables from the control enclosure
to the second expansion enclosure as shown in Figure 2. The second expansion
enclosure is above the control enclosure. Figure 2. Adding a second expansion enclosure
- Port 2 5 of the left canister, control enclosure, attaches to Port 1 6 of the left canister, expansion enclosure 2.
- Port 2 7 of the lower canister,
control enclosure, attaches to Port 1 8 of
the lower canister, expansion enclosure 2. The port locations on the
lower canister are inverted from the port locations on the left canister.
Port 1 on the lower canister is opposite port 1 on the left canister. Note: The connecting sequence from port 2 of the node canister is called chain 2.
- Attach the SAS cables from the first expansion
enclosure to the third expansion enclosure. See Figure 3. Figure 3. Attaching SAS cables to the enclosures
- Port 2 9 of the left canister, expansion enclosure 1, attaches to Port 1 10 of the left canister, expansion enclosure 3.
- Port 2 11 of the lower canister, expansion enclosure 1, attaches to Port 1 12 of the lower canister, expansion enclosure 3.
- Attach SAS cables for more expansion enclosures.
You can add up to nine expansion enclosures. You add a fourth expansion
enclosure at 13 and 14 on
expansion enclosure 2.
- Add the enclosures alternately to chain 1, and then chain 2.
- Use port 2 on the canisters that are already connected to attach to port 1 on the canisters of the enclosures that you want to add.
- Verify your cabling.
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